无电磁场情况,粒子机械动量=粒子正则动量
回答: 整个银道面内的引力场强都不是与到. 银心距离r 的平方成反比,太阳附近的引力 场强只近. 似与到银心之距r 的1. 5 次方成反
由 marketreflections
于 2011-03-04 17:30:49
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